That, techmike, is a SWEET frickin' setup! For those unawares, the MAS is also a direct impingement gas gun, based on a design predating WWII. With the MAS the gases are vented out of the action however, negating the whole "You don't crap where you eat," criticism of the AR series. So was that originally 7.5 French? That has some hellacious ballistics! Jon